mcgregor



(No Model.) 4 Sheets-Sheet 1.

R. MQGREGOR. APPARATUS FOR SHARPENING THE GUTTERS AND FINGERS OF REAPING AND MOWING MACHINES.

No. 411,048. Patented Sept. 17, 1889.

N. PETERS. Pmwumu m m. wmm mn. n.c

(No Model.) 4 Sheets-Sheet 2.

R. McGRE-GOR. APPARATUS FOR SHARPENI-NG THE OUTTERS AND FINGERS 0F REAPING AND MOWINGAMAGHINES.

No. 411,048. Patented Sept. 1'7, 1889.

N. vzrcna PhMo-Liihn m hen wuhinmn, n. a

(No Model.) 4 Sheets-Sheet 3.

. R. MOGREG'OR. APPARATUS FOR SHARPENING THE GUTTERS AND FINGERS 0F BEARING AND MOWING MACHINES. No. 411,048. Patented Sept. 17, 1889.

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(No Model.)

4 Sheets-Sheet 4.

. R. MQGREGOR. APPARATUS FOR SHARPENING THE GUTTERS AND FINGERS 0F REAPING.AND'MOWING MAUHINES.

Patented Sept. 17, 1889.

wv'lnesses mm; Tn w@% 2 W. PETERS. Pham nmu r hen, Washington. D. C.

UNITED STATES PATENT OFFICE. 1

ROBERT MCGREGOR, OF LEIGH, coUNTY OF LANCASTER, ENGLAND.

APPARATUS FOR SI-IARPENING THE CUTTERS AND FINGERS OF REAPING AND MOWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 411,048, dated September 17, 1889.

- Application filed July 8, 1886. Serial No. 207,429. (No model.) Patentedin England uly 1, 1886, No. 8,607; in France July 31, 1886,1To. 177,711, and in Germany August 15, 1886,1To. 39,435.

To aZZ whom it may concern.- I Be it known that I, ROBERT MCGREGOR, a subject of the'Queen of Great Britain and Ireland, residing at Leigh, in the county of Lancaster, England, have invented Improvements in Apparatus for Sharpening the Outters and Fingers of Reaping and Mowing Machines, (for which I have obtained British patent, No. 8,607, dated July 1, 1886; French patent, No. 177,71l,dated July 31, 1886, and German patent, No. 39,435, dated August 15, 1886,) of which the following is a specification.

' The object of this invention is to construct an improved sharpening or grinding apparatus of that class in which the emery or other sharpening or grinding wheel or disk is capable of being moved at will either backward,

' forward, upward, downward, or toward either side. This universal movement of the grinding-tool has heretofore been provided for by using a flexible or jointed shaft. I, however, mount my shaft in firm bearings in a frame,

' which is universally mounted to give the desired movement to the tool.

In the accompanying drawings, Figures 1 and 2 are elevations of my improved machine. Fig. 3 is a plan view; Fig. 4., a sectional view,

drawnto an enlarged scale and illustrating the manner of mounting the grinding-disk upon the end of its shaft. Fig 4 is a sectional view of the same parts detached; Fig. 5, an

elevation at the grinding end of the spindle. 1

Fig. 5 is a corresponding plan view. Fig. 6 is a vertical section, drawn to an enlarged scale, of the clamp for the cutters and fingers of the reaping-machines; Fig.7, aplan View of apart of the machine, showing its use for grinding the harvestenfingers; and Fig. 8, a transverse section illustrating a modification. According to the first part of my invention the stand or frame of the machine consists of two parallel side tubes or bars a and two end plates or brackets b c, securely fastened to gether and supported upon legs. These legs are tied together by stays, to which lattach the brackets to carry a foot-treadle d and a fly-wheel shaft c. On the two parallel side tubes or bars a, I place a cross-piece f, having sockets or tubes f, which fit the two parallel side tubes or bars and are free to slide on the same. In a central hole in the cross-piece f, I place the stem of an upright fork g, which carries a cross-shaft h. On this cross-shaft 7b is mounted a small grooved pulley 1', having a beveled friction-wheel 1'', cast or formed to the side thereof and free to revolve on the crossshaft. Between the arms of the upright fork g and the ends of the bosses of the grooved pulley 1 and the beveled friction-wheel '6, I

place or hinge the ends of a light movable frame 70, which carries the grinding apparatus. The latter is, through the medium of the devices described, universally mounted on its frame.

The grinding device consists of a spindle having at one end a small emery or other grinding wheel Z and at the other end a bevelpinion m, which is covered with india-rubber or other suitable material and driven by frictional contact with the bevel -whee1 c, the

necessary pressure being obtained by a spring and washer placed within or between the end of the movable frame 70 and the boss 1'? on the back of the bevel-wheel. On the fiy wheel shaftis mounted a fly-wheel n, having a groove in its periphery to correspond with the grooved pulley c' on the cross-shaft, and motion is communicated by means of a cord or gut.

the front end bracket 1) of the main frame I form a flange or plate for carrying the knife or finger-bar to be operated upon, and this flange or plate has a spring bolt and clip 0 to hold the object firmly when desired, and this clip can be released by the operator pressing the knob at the lower end of the bolt. An enlarged View of this spring-b0lt and clip is shown in Fig. 6, where it is also shown provided with an additional claw o',for securing that portion of the knife which has the knifehead attached to its upper side.

On the front end braoket'b, I form or cast two sockets b, to carry a sliding tube or bar 19, at right angles to the parallel tubes or bars of the main frame. At ornear the ends of the sliding tube or bar 13 the knife 0, or the fingerbar to be operated upon, is secured. It may thus be easily moved in a straight line to the right or to the left whenever the spring-bolt 0 is acted upon by the operator.

On the forward end of the movable frame 7;, I place ahandle q, secured by a belt or pin q, and so cranked and arranged as to assume a convenient position, say, to the right of the grinding-wheel. By slackening the belt or pin q the handle may be moved to a similar position at the left of the grindingwheel; or it may be secured so that the stem shall be directly over the grinding-whee],as shown in dotted lines, Fig. 7. Thelatter is a plan view of a portion of the machine, showing it applicable to grinding or sharpening the fingersections without removing the lingers from the finger-bar. It will be readily seen that owing to the universal jointing of the grinding-wheel to the frame, and as the handle is capable of being placed over the apparatus clear of the object to be operated upon, the grinding-wheel can be carried entirely around the point of a finger for thoroughly sharpelr ing the same.

Figs. 5 and 5 are enlarged views (elevation and plan) showing the grinding-wheel Z in po sition foroperating on a knife of that class in which the sections are placed underneath the bar and on'which ordinar grinders are unable to operate effectively without damaging the knife-bar. It will be seen that by this arrangement the sections can be operated upon close up to the bar, but without touching it.

It will be evident that by the universal mounting of the grinder, as described, the operator can move the grindingavheel into any desired position. Thus he can move it backward and forward owing to the eross piece sliding on the parallel tubes or bars. He can move itto the right or to the left by reason of the stem of the upright fork swiveling in the hole in the center of the cross-piece, and he has the up-and-down movement, owing to the movable frame being hinged or centered 011 the cross-shaft, which is carried by the upright fork.

In order to secure the grinding-wheel 2' to the spindle and to avoid any projection on the side nearest the operator, and at the same time to effectually fasten it, so that itmay be turned in either direction without becoming loose, I form or east the same on a metal boss 5, Fig. :4, whichis flush with or slightly within the side of the wheel nearest the operator and projecting at the back. The outside of this boss has a screw-thread, and Iform a slit in it a suflieient distance to receive a small pin 11', Fig. l, which is fixed in a hole in the grind ing-spindle t. A nut u is screwed on the portion of the boss that passes the small pin, and this nut covers and firmly secures it, the side of the nut bearing against the end of the pin t when screwed up.

In order to enable the operator to keep the grinding-wheel i at uniform level for giving the desired angle to form the cutting-edge, I make use of an adjustable pin 1*,l' ig. 1, which fits in a boss or groove on the under side of the movable frame 7; and is secured thereto after adjustment by means of a clip and thumb-nut v,the lower end of the pin touching a level plate which extends between the two parallel tubes and forms part of the front-end bracket 1) of the machine. To give a constant momentum to the grinding-wheel and not undulyadd to the weight of the main flywheel, I make use of a small fly-wheel m on the grimling-spindle at the back of the bevel-pinion m and form-i n g a part thereof.

To enable the operator the more readily to work the treadle with one foot, I make use of a spiral or other spring 00, which shall retain a portion of the power given out 011 the downward stroke of the treadle and utilize the same 011 the upward stroke.

As a modification of my invention, in lieu of the sliding eross-piecef and swivehfork g, I make use of two separate tubular slides or bcaringsf f free to slide one on each of the parallel tubes or bars a. (See Fig. 8.) These tubular slides f f are formed with vertical sockets on their upper sides to receive the vertical pins or trunnions of a pair of bearings g g for the eross-shaft 71, to which the movable frame 71: is attached, as in the first-mew tioned arrangement.

As a modification of the gearing for driving the grinding-spindle, (see Fig. 8,) I some times use a second beveled. friction-wheel i on the cross-shaft h, placed facing the other wheel i, so that there is one wheel on either side of the bevelpinion m to drive the lat ter. These two wheels t" and i are operated by separate cords c c from the main flywheel, and one of the cords c is of course crossed, so as to drive the corresponding bevel-wheel in an opposite direction to the other. The object of employing two of these frictional drivingavheels to act at the same time upon the bevel-pinion on the shaft 6 is to give increased driving power or contact with the bevel-pinion and to equalize the pressure and reduce the liability to wear the bearings of the grinding-spindle at the end which carries the bevel-pinion.

In the Letters Patentissued to me June 11, 1889, No. 404,97 (3, on an application which is a division of the present case, I have illustrated another construction of machine embodying the main principle of my presentinvention.

I claim as my invention- 1. The combination of a fixed frame with a frame universally join ted to the fixed frame and carrying a revolving spindle and grinding-wheel, substantially as specified.

2. The combination of a fixed frame and a piece movable thereon, witha fork swiveled. on the said movable piece, a movable frame upon the swiveled fork, and a revolving grinding-spimlle carried by the movable frame, all substantially as set forth.

3. The combination of a iixed frame and a cross-piece adapted to slide thereon, with a swiveled fork mounted upon. the sliding piece, a movable frame on the'fork and a revolving'grinding-spindle carried by the movable frame, all substantially as set forth.

4. The combination of a fixed frame and driving devices thereon, with the horizontally-movable frame, a fork swiveled vertically on the latter, the frame 70, pivoted horizontally to the fork, and a rotary grindingwheel mounted in the frame is and driven from the fixed frame; all substantially as specified.

5. The combination of the frame with a spring-bolt and clip 0, having an extra claw o, as and for the purpose specified. 

